Method of treating cod-liver oil



Patentetl Feb. 4, 1930 UNITED .srArEs PATENT foF-me com; o. HAITI-TON, or MOUNTAIN LAKES, NEw JERSEY; BENJAMIN n. THURMAN, or

'rncxAnoE, NEw YORK; AND LOUIS e. cams, on EAYoNNE, NEw JERSEY, AssreNons, BY nEsNE ASSIGNMENTS, ro nnsr roons, me, on NEw YORK, N. Y., A

COBPQRATION OF NEW JERSEY METHOD OF TREATING COD-LIVER OIL Io Drawing. Original application filed July 31, 1925, Serial No. 47,228. Divided and this application filed 1 August 6, 1926. Serial No. 127,704.

the greatest quantity in cod-liver oil extracted from freshly caught fish.

The'diificulty encountered heretofore in the 5 addition of vitamins from cod-liver oil to nut margarine, has been that the resulting prodnot is possessed at the beginning with a characteristic taste and odor of the cod-liver oil,

and'in many instances the cod-liver oil has.

had unpleasant effects upon the stomachs of those who ate the food product We have discovered a method by which the cod-liver oil may be purified and added to the margarine without the bad effects above noted.

The method preferred by us is to treat the cod-liver oil so as to neutralize or otherwise remove those substances which cause the 0bjectionable odor and taste by any suitable means.

A method which we have used to'successfulll i refine the cod-liver oil is as follows:

e capacity of the tank used for the pur-' pose is conveniently 4.0 gallons so that 40 gallons is the amount of oil used per batch. The oil is brought to a temperature of about 70 F. A certain leeway is permissible. Care should be taken, however, to keep the oil below 80 F. and 70 F. is a convenient ob'ective.

e preferably take about 10% by weight of 16 B. caustic soda and add-it to the oil rapidly by vigorous agitation, the object being to combine the caustiesoda with the oil as quickl as possible. The amount of caustic may e reduced to 7% to 8% when the fatty acid of the oil is less than 1%,. The amount of caustic soda used varies directly as the fatty acid content. The object is to neutralize the fatty acid. This can be deter- 60 mined by the titration test for neutrality.

minutes.

est sources of vitamins is marine oil, such 1 as cod-liver 011. The vitamins are present in This agitation is continued for about 15 At the end of the 15-minute stir ring period, the oil is heated slowly to about 120 F. This heating operation preferably requires about 20 minutes or longer. The oil is preferably agitated throughout the entire heating period, but the violence of the agitation is gradually reduced. Thwe details are subject to revision on the part of the operator since the'foots may'attain a condition suitable for settling before the end of the 20 minute periodor before the oil reaches 120 F. I The oil should therefore be heated gently to about 120 F. and stirred slowly until the foots is in a suitable condition for settling at which time the stirring and heating can be stopped. In no case, however, should the oil be heated substantially above 120 F.

The oil is then allowed to settle for, not less than 3 hours, preferably over night.

After settling, the oil is drawn off from the soap and transferred to another kettle and about .50% by weight of a clarifying agent or agents added and mixed with the oil thoroughly. W'e have successfully used .25 diatomaceous earth and 25% bleaching carbon as the clarifying agents.

Immediately after adding the clarifying agents, the oil is again heated to about 120 F., stirring is continued for 1 hour from the time of the addition of the clarifying agents. The oil is then filtered through a filter-press to clarify it. After the oil reaches 120 F. it is kept at this temperature until ready for filtering.

After filtering, the oil isallowed to cool to room temperature after which it is ready for percolation through any suitable apparatus. The apparatus above referred to consists in means forholding granular active carbon through which the oil is percolated, while at the same time a non-toxic, non-oxidizinggas, such as carbon-dioxide gas, is passed through the apparatus in a direction op osite to that of the oil.

ile we refining step cfore percolating the oil, we would like to have it understood that this refining step is not always necessary, as the refer to use the preliminary i above described, and without using'the pre- 2' e g I 1,745,531

principalbenefits of our invention ma be secured by merely percolating the o1 as limin'a-ry refining step. I V This isa division of our applicationSerial .No.-47,228, filed July 31, 1925.

We claim: 1. The -method of deodori'zing cod-liver oil, which consists in passing the oil at sub-' stantially room temperature through agran- I ular active carbon while passing a non-toxic and non-oxidizing as throu hthe oil.

2. The method 0 deodorizmg cod-liver oil,

which consists-in passing the oil at substantially' room temperature through a mass of active carbon while passing carbon-dioxide through the mass in opposite direction to that of the oil.

. 3. The method of deodoriz ing cod-liver .oil, which consists in passing it at substantially room temperature through a massof active granular carbon while passing carbondioxide through the mass in opposite direction to that ofthe oil.

4. The method of deodorizing cod-liver; oil which consists in agitating said oil with an alkali, settling and filtering the oil to remove the foots, then passing the oil at, substanti'ally roomtemperature through granular active carbon while simultaneously passing anon-toxic and non-oxidizing gas through the oil in opposite direction to the flow of the oil. J p

a J. o. HAMILTON.

BENJAMIN H. THURMAN. LOUIS G. COPES. 

